I don’t understand how to really do this

The answer would be D, or m angle A = 55 degrees.

Step-by-step explanation:

This angle complements the other 55 degree angle below it.

As for the other options, keep in mind that a straight line equals 180 degrees. Using the complementary angles, we can infer that angle B is equivalent to 55 degrees and and angle C is equivalent to 60 degrees. I got angle B by subtracting 60 and 65 from 180, giving me 55.

I hope that makes sense!

step-by-step explanation:

there is a formula i can give you:

it is r^2*n*sin(360/n) divided by 2 where r represents the "radius" and n is the number of sides.

plug them in:

(10sqrt(3))^2*6*sin(360/6) divided by 2

100*3*6*sin(60) divided by 2

900*sin(60)

900*sqrt(3)/2

450*sqrt(3)

approx is 779.4 cm^2

b i think

step-by-step explanation:

not really sure